LAS VEGAS (KSNV MyNews3) -- Students are taking an important test but this one is for possible tuberculosis this week.

This investigation continues as one person was recently found to have an active case that happened earlier this month at Coronado High School.

TB testing is usually done two ways -- drawing blood or taking a skin test.

Dr. Lubna Javed , a family practice doctor at Health Care Partners, said a tiny amount of TB bacteria material is injected into the skin to see how it reacts.

“The body is going to form a reaction or it’s going to react to that deadly bacteria you are putting in and it would show on your skin as a reaction and that is what we read to find out if you’ve been exposed,” Dr. Javed said.

But you have to come back in two to three days for a doctor to check for results and further testing.

If you carry a dormant case or had a vaccine,that will likely react. Dr. Javed says for the number of students and staff members being tested after possible exposure with an active case, the newer type of blood test for TB is much more efficient.

“You don’t have to return. You give your blood; you get your results in 24 hours. It does not affect if you have VCP (checking) vaccine and it’s a quicker way of doing it,” Dr. Javed said

For the next three days more than 300 at Coronado High School are being tested as an active investigation by the Southern Nevada Health District is under way.

The commotion of someone having an active case has some students like Thomas Knickmyer and Austin Garcia wanting to be tested even though they weren’t required to be by the health district.

“Mostly my mom wants me to get it done because she’s gotten tested before and it’s not that big of a deal to get tested. So she thinks I should be tested instead of ending up with it, so.”

“Mainly, it’s my choice to get tested, plus my parents would like that too, just in case. Better to be safe than sorry,” said Garcia.

“Do not panic. People usually freak out when it comes to tuberculosis. If you‘ve had a recent contact with a patient who has active tuberculosis you absolutely need to be tested," Dr. Javed said.